两种不同改性方法制备的Ag-TiO_2薄膜光催化活性研究

Photocatalytic Activity of Ag-TiO_2 Thin Films by Two Different Modified Methods

以溶胶凝胶法在平板玻璃表面负载了TiO2薄膜,用不同浓度AgNO3溶液浸渍,然后进行了光照还原法和煅烧分解法Ag改性.以甲醛为模拟污染物,考察了两种方法改性的Ag-TiO2薄膜的光催化活性.结果表明:光照还原法在AgNO3溶液为0.1moL/L时Ag改性的TiO2薄膜催化活性最强,其催化活性是纯TiO2薄膜的2.3倍;煅烧分解法AgNO3溶液为0.05moL/L时Ag改性的TiO2薄膜催化活性最强,其催化活性是纯TiO2薄膜的2.9;分析了两种不同改性方法提高TiO2薄膜催化活性的机理.

Ag-TiO2 thin films were prepared as follows：TiO2 thin films were prepared using sol-gel method and subsequently dipped in AgNO3 solution,then they were illuminated and calcined,respectively.The photocatalytic activity of Ag-TiO2 thin films was tested using phenol degradation as the model reaction.The results indicated that when the concentration of AgNO3 solution was 0.1 moL/L,the photocatalytic activity of the photodeposited Ag-TiO2 thin films was 2.3 times of that of pure TiO2 thin films,when the concentration of AgNO3 solution was 0.05 moL/L,the photocatalytic activity of the calcined Ag-TiO2 thin films was 2.9 times of that of pure TiO2 thin films.The mechanism of two modification methods to improve activity of TiO2 thin films were analyzed.